package com.shuai.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

//sqlSessionFactory  来构建sqlSession
//基本上不用变
public class MybatisUtils {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            //使用mybatis获取sqlSessionFactory对象
            String resource = "mybatis2-config.xml";//唯一要变得化也就是这里了
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //既然有了sqlSessionFactory顾名思义，我们就可以从中获得SQLSession的实例了。
    //SQLSession完全包含了面向数据库执行sql 命令的所有方法
    public static SqlSession getSqlSession(){
        return  sqlSessionFactory.openSession();
    }

}
